Lots of threads on the care and feeding of LiPolys are out there, but it never hurts to reiterate best practices one more time...

LiPolys are, in my opinion, only as dangerous as the person charging them is careless.

Many people advocate charging LiPolys in a fireproof safe at the very least. Nothing wrong with that, because it gives you a sturdy box to store and transport the batteries. The main issue here is to separate the batteries from combustibles, and to that end, a nice Pyrex dish and some due diligence works just as well as any fireproof safe.

One misconception about LiPolys is that you have to "hover" over them with fire extinguisher in hand while they charge. Monitor the charge does not mean you have to stare at them the entire time. Just don't put the packs on charge, then go shopping, go to bed, or retreat to the far end of the house for several hours. Monitor means check back as often as necessary to make you feel comfortable, and be close enough to detect and handle a fire should one break out.

The most important thing about caring for and feeding LiPolys is to not abuse them in the first place, and not give them a reason to fail. Use a quality charger that's designed to handle LiPolys. The charger should be easy to operate so there is little chance of using the wrong settings. A more complicated charger means YOU have to be that much more diligent in making sure the settings are correct before you start charging.